This thesis explores the ability to weld steel mixing SKD 61 using gas metal arc welding processes cover (Gas metal arc welding process: GMAW) welding process, transfer of molten metal spray (Spray transfer) and the transfer of molten metal form (Pulsed transfer), and studies phan welding on the work piece has 3 different types of conditions is 1), the work piece is not through hardened 2) workpiece through hardened and 3) workpiece through hardened and stress. The variables studied include electricity and gas flow rates. By inspection of the structure and mechanical properties tests include testing the hardness, tensile and impact testing, and comparative analysis of the experimental results. From the experimental results, gas metal arc welding, it found that covered the transfer of molten metal spray flow values for best welding alloy hot work SKD 61 with the transfer of molten metal spray is A 150 current and flow rate L/min 13-gas section to transfer the molten metal is the pulse flow and flow rate of a gas flow rate of gas 190A 1 L/min from the effects on the microstructure showed a Marta structure pour nasai. (Martensite) caused by the change from the hostel nanai (Austenite) resulting from heat treatment of welding on the floor that is a ferrite Matrix (Ferite), which resembles a large phase result in increased strength values.
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